Zallaq boasts a year-around average temperature of 26.1°C, peaking at 34.0°C in August, its warmest month, and dipping to an average low of 17.5°C in January, the coolest. Rainfall averages at 5.4mm annually, with February seeing the heaviest showers and May, June, July, August, September, October, November being the driest month.
Month | Temperature (Celcius) | Rainfall (mm) |
| January | 17.5 | 14.5 |
| February | 18.3 | 16.0 |
| March | 21.4 | 14.0 |
| April | 25.5 | 9.9 |
| May | 29.1 | 0.0 |
| June | 28.7 | 0.0 |
| July | 33.3 | 0.0 |
| August | 34.0 | 0.0 |
| September | 32.3 | 0.0 |
| October | 29.1 | 0.0 |
| November | 24.4 | 0.0 |
| December | 19.6 | 10.9 |